UBNT Bug Bounty #3 - Persistent Filename Vulnerability

[Vulnerability Lab <research () vulnerability-lab com>]

Document Title:
===============
UBNT Bug Bounty #3 - Persistent Filename Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1467

Video: http://www.vulnerability-lab.com/get_content.php?id=1468


Release Date:
=============
2015-08-11


Vulnerability Laboratory ID (VL-ID):
====================================
1467


Common Vulnerability Scoring System:
====================================
4.2


Product & Service Introduction:
===============================
Ubiquiti Networks is an American technology company started in 2005. Based in San Jose, California they are a 
manufacturer of 
wireless products whose primary focus is on under-served and emerging markets.

(Copy of the Homepage: http://en.wikipedia.org/wiki/Ubiquiti_Networks )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered an application-side input validation web vulnerability in 
the official Ubiquiti Networks Community online service web-application.


Vulnerability Disclosure Timeline:
==================================
2015-03-17: Researcher Notification & Coordination (Hadji Samir)
2015-03-18: Vendor Notification (Ubnt Security Team - Bug Bounty Program)
2015-04-12: Vendor Response/Feedback (Ubnt Security Team - Bug Bounty Program)
2015-07-09: Vendor Fix/Patch (Ubnt Developer Team)
2015-08-11: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
Ubiquiti Network
Product: Ubnt Community - Web Application (Online Service) 2015 Q2


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Technical Details & Description:
================================
An application-side web vulnerability has been discovered in the official Ubiquiti Networks Community online service 
web-application.
The vulnerability allows an remote attacker to inject own script code to the application-side of the affected 
application module.

The web vulnerability is located in the `filename` value of the `gallery page album upload` module. Remote attackers 
are able to inject own files 
with malicious `filename` value in the `album upload` POST method request to compromise the ubnt web-application. 
Remote attackers are also able 
to exploit the filename issue in combination with persistent injected script codes to execute different malicious 
attack requests. The attack vector 
is located on the application-side of the ubnt service and the request method to inject is POST. 

The security risk of the application-side web vulnerability is estimated as medium with a cvss (common vulnerability 
scoring system) count of 4.2. 
Exploitation of the application-side validation web vulnerability requires no user interaction and only a low 
privileged web-application user account. 
Successful exploitation of the security vulnerability results in the ubnt community web-application compromise.

Request Method(s):
                                [+] [POST]

Vulnerable Module(s):
                                [+] gallerypage (upload)

Vulnerable Parameter(s):
                                [+] filename (Album)

Affected Module(s):
                                [+] confirmationpage


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attackers with low privileged application user account and with low user 
interaction. 
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to 
continue.

Manual steps to reproduce the vulnerability ...
1. Open link http://community.ubnt.com/t5/media/gallerypage
2. Click add images
3. Upload image with name "><img src="x" onerror=alert(document.cookie)>.png
4. Click selact an album and save
5. Post comment
6. Click selete the comment you will redirect to http://community.ubnt.com/t5/action/confirmationpage
7. Now you will see the alert with the document cookies context!

PoC Video: http://www.vulnerability-lab.com/get_content.php?id=1468


Reference(s):
http://community.ubnt.com/
http://community.ubnt.com/t5/media/gallerypage
http://community.ubnt.com/t5/action/confirmationpage


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerable filename value in the album add module.
Restrict the input and encode the filename to prevent further script code injection attack that runs through the 
application-side.
Disallow special chars and implement a secure exception to prevent the execution itself.


Security Risk:
==============
The security risk of the application-side album filename input validation web vulnerability is estimated as medium. 
(CVSS 4.2)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Hadji Samir [samir () evolution-sec com]


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=========================
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